Hydropneumatic press.



PATENTED JULY 10, 1906.

E. D. CODDINGTON. HYDROPNBUMATIO PRESS. APPLIOATION FILED AUG 5 1903 2SHEETS-SHEET 1.

PATENTED JULY 10, 1906.

E. D. GODDINGTON. HYDROPNEUMATIG PRESS. APPLICATION FILED AUG.5, 1903.

2 SHEETSSHEBT 2.

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I V Z) maQ UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented July 10, 1906.

Application filed August 5, 1903. Serial No. 168,250.

To aZZ whom it may concern.-

Be it known that I, EDWIN D. OODDINGTON, a citizen of the United States,residing at North Milwaukee, in the county of Milwaukee and State ofWisconsin, have invented certain new and useful Improvementsv inHydropneumatic Presses, of which the following is a specification,reference being had to the accompanying drawings, forming a partthereof.

This. invention relates to machines in which a ram or plunger is oerated by an elastic fluid through the me ium 'of an inelastic fiuid andthe pressure is augmented at the end or any part of the working strokeof said ram or plunger by an auxilia plunger or intensifier ofcomparatively smal area.

The main object of the invention is to simplify and im rove theconstruction and operation of mac ines of this class.

It consists in certain novel features of construction and in thepeculiar arrangement and combinations of parts, as hereinafterparticularly described, and pointed out in the claims.

For the purpose of illustration I have. shown a riveting press ormachine embod ing the invention, which, however, is app icable withlittle or no change to other purposes.

In the accompanying drawings like characters designate the same parts inthe several figures.

Figure 1 is a view, partly in side elevation and partly in verticallongitudinal section, of the machine. Fig. 2 is an axial section of themechanism for operating the ram or pluner which carries the movable die;and Fig. 3 IS an enlar ed cross-section on the line 3 3, Figs. 1 an 2,showing the controlling-valve of the motor which operates the movabledie or ram.

Referrin to Fig. 1 of the accompanyin drawings, t e frame of the machineis formed with two op osin jaws a a, one of which carries the fixe diethe other being formed or rovidedwith a cylinder 0 op osite and in 'newith the fixed die. In t 's cylinder a ram or plunger (1 is fitted towork, and to this ram the movable die e is ad'ustabl attached by a screwe. The cylin er an ram are preferably of the differential type, with oneend. of each nearest the die of lar er diameter than, the other end. Forwithhrawing the ram and movable die away from the fixed die acompressed-air or other fluid supply connection f is made with thelarger end of the cylinder 0. To force the ramdtoward'the fixed die andto reduce the working stroke of the movable ie, a cylinder g, having twoindependently-movable pistons h and 'i, is provided. This cylinder hasat one end an extension consisting of two tubular parts 7' and 7c oflarger and smaller bores or diameters, respectively. Referrin to Figs. 2and 3 in connection with Fi l, 51o 1parts of this extension are arrangecl coaxial y with each other and with the cylinder 9 and normallycommunicate with each other at their a joining ends. The other end ofthe smaller part k communicates with the smaller end of the cylinder 0.The piston it has a tubular lunger l, which extends into and works eelyin the larger part 7' of said extension, and the piston 't has a lun erm, which is fittedto work in the tubu arp unger land normall projectsthrough it into said part 7' and is a apted to work in the smaller partk of said extension. The head of the c linder g opposite the extension7' k is forme with an extension n, having abore in line with the axis ofthe cylinder, and the piston '11 has a tubular stem 0, which is fittedin said bore and may be formed as shown, inte ral with the plunger m.The passage p in t e stem 0 communicates at its inner end throughlateral openings or branches gwith the space between the two pistons han 'i. The extension at is also formed with a-valve-chamber r,communicating through a assagp s with the outer end of the bore in w 'cht e tubular stem 0 works and through a passage t with the space betweenthe adjacent cylinder-head and the piston i. A rotary va ve 0, formedwith an axial exhaust-passage w, is fitted in said chamber. A pipe orpassage :1: connects said chamber with a source of com ressed air orother fluid under pressure, an an exhaustpipe y, attached to theextension 1, as shown in Fig. 3, communicates with the exhaustpassa ewin said valve. At its end opposite the e aust-pipe the valve has a stemwhich projects through a stufiing-box and is provided with an arm 5.This arm is connected witha hand-lever 6 near the dies, as shown in Fig.1,'or any other suitable connection for operating said valve may beemployed. Be-

tween the cylinder g and its extension j k suitable packing z isprovided around the tubular plunger Z. Packing 2 is also provided in theouter end of the tubular plunger around the plunger m. Between t eparts;

and 7c of the cylinder extension packing'3 is provided to preventleakage back from part is into part 7' whenthe lunger m is advanced, andpacking 4 is provi ed in the opposite cylinder-head around thetubularstem'o. The extension 7c is filled, by means of a pipe u, withoil or other inelastic fluid when the'plunger d is in its upperposition, as shown in Fig. l, and the pistons h and i, with theirplungers l and m, are in their initial positions, as shown in Fi 2, andsaid plungers are so proportione that when advanced into said cylinderextension 7' 7c their displacement of the oilor other liquid containedtherein will'before the plunger m reaches the limit of its advancemovement fill the smaller end of the cylinder normally occu ied by theram (1, and thereby force sai ram to the full extent of its-movementtoward the fixed die I).

The machine hereinbefore described operates as follows: The pistonshandi, the intern sifier plungers Z and m, and the valve 4) normallyoccupy the positions in which they are shown in the drawings, and theram '1) is forced back intoand held in the smaller end of'cylinder c bythe constant admission of compressed air or other fluid underpressureintothe larger end of said cylinder 0 through the connection f. Thework'being-placed between the jaws a of the frame with the rivettofbeupset' in line with thedies, b and e, the

" valve '0 is first turned to the left, thereby establishingcommunication between-thezpas sage s and the supply-passage 1v.Compressed air or other fluid under pressure is thereby admitted throughsaidipassages and the passage p into the space betweenthepistons hand z.The piston '5 remaining stationary, the piston h isadvanced-or-movedto'theleft'with the'tubular or larger inten'sifien lunger l, whichdisplaces the oil' or other; iquid in the larger part 9' of the cylinderextension and forces said liquid therefrominto the c linder 0, therebyquickly moving the ram {with the die e, against the rivet-and partiallyu etting-the same. The valve 'v'is nowturne back to the rightsuflicientlyto connect the passage 8 with the exhaust-pas sage 'w andpipe y and the passage twith-the;

supply-passage w. The piston vl-isthereupom advanced or moved with thesmaller intensit fierlunger m to the left, the air or otherflui'cFfbetween the I two pistons escaping; through-the passages 10, s,and 'w. As the lunger m enters the bore of the small'erfpart I ,or thecylinder extension the-liquid-contained. therein is prevented-by thepacking 3 i from escaping into the larger part 7' of said cylinderextension and as said p'l 7 er mlad- .vanees, displacing theliquidin-said part 7:. anil forcingit into the smallen endof-*said'cylinder c, the ramd, with the' die e, isadvanced with greatforce against the rivet supportedby the die 6, thereby completelyupsetting and forming ahead on said rivet. T e valve om the cylinder 9through the passages t and 'w, and also, if necessary, through thepassages p, s, and w, communication between said passages and thesupply-passage so being cut oil in this position of the valve. Thecompressed air or other fluid under pressure constantly admitted throughthe connection f to the larger end of the cylinder 0 thereupon forcesthe ram (1 back to its original position in the smaller end of saidcylinder, displacing the liquid therein and forcing it back into thecylinder extension 7' k. The liquid thus forced'from the cylinder 0 bythe ram (1 reacts first on the plunger m and then on the plunger Z toreturn the pistons i and h, with said plungers, to their originalpositions, as shown in the drawings. The machine is now ready foroperation upon another rivet.

Various modifications in the minor details of constructionv andarrangement of parts may be made without materially affect the operationof the machine and within the principle and intended scope of myinvention.

I cla1m 1 Ina hydropneumatic press the combination with a ram and acylinder therefor, of a cylinder provided with two independentlymovableplstons, and with a tubular extension having larger and smaller bores,and plungers attached to said. pistons and fitted one within the otherto work in the smaller and larger bores respectively of said cylinderextension, substantially as described.

2'. In ahydropneumatic press the combination with a ram and a cylindertherefor ofcoaxial chambersoflarger and smaller diameter communicatingwith each other and through the smaller chamber with said cylinder, acylinder provided with two independently-movable pistons and with fluidsu pl Y and exhaust connections and passages lhacfing. therefromto thespace between the two: pistons and the-space between one of said pistonsand the adjacent cylinder-head, a valvecontrolling said-passages,andplungers fitted' one the other to werkin said: dhanibers and attachedto said pistons, sub-- stantially as described.

3. In a hydropneumatic press thecomhi nation with a ramand; a cylindertherefor, or a cylinderiprovid'edwith two independentlymovalilepistonsand at .theends Wlthiillblllfil) extensions one of which has a largerand-a smaller bore communicating with the ramcylinder, a tubular plungerattached to-one piston-and fitted to work in the dargerbore, a smaller,lunger attached to'the cthergpi stenand 'fitte' {to workthroughthetubularplnmger into the'smaller bore of one cylindeneletension, thelastmamed pistonihaving a tubu lar'stem-fitted'in-theother cylinder extension and communicating with the space between saidpistons, and valve-controlled fluid supply and exhaust connectionscommunicating with said tubular stem and with the space betweenonepiston and the adjacent cylinder-head, substantially as described.

4. In a hydropneumatic press the combination with a differential ram andcylinder therefor having a fluid-sup ly connection at the 'lar er end,of a cylin er provided with two in ependently-movable pistons and withan extension having larger and smaller bores connected with thesmallerend of the ramcylinder, plungers attached to said pistons and adated to work one within the other in the sma ler and larger boresrespectively of said cylinder extension, and means for admitting andreleasing an and from the space between said pistons and the'spacebetween one of them and the adjacent cylinder-head, substantially asdescribed.

5. ha hydropneumatic press the combination with a ram and a cylindertherefor, of

actuating fluid to a cylinder provided with two independentlymovablepistons and with an extension having lar er and smaller borescommunicating throug the smaller bore with the ram-cylinder, a tubularplunger attached to one piston and fitted to work in the larger bore,and a longer plunger of smaller diameter attached to the other pistonand fitted to work through the tubular plunger into the smaller bore ofsaid cylinder extension, which is provided between its larger andsmaller bores with packin fitting the smaller plunger and between itsarger bore and the piston-cylinder with packing fittin the largerplunger, which is in turn provide with packing fitting the smallerplunger, substantially as described.

In witness whereof I hereto aflix my signature in presence of twowitnesses.

EDWIN D. CODDINGTON. Witnesses:

MAUDE L. EMERY, CHAS. L. Goss.

